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Scanning electron microscopic investigation of the smeared layer on root canal walls

  • Author Footnotes
    1 Dr. Mader is chief, electron microscopy laboratory. Division of Research Sciences. US Army Institute of Dental Research. Walter Reed Army Medical Center, Washington, DC. Dr. Baumgartner is director, endodontic residency. US Army Institute of Dental Research, Walter Reed Army Medical, Center. Washington, DC. Dr. Peters is commander. US Army Dental Activities, 123rd Medical Detachment (Dental Service), APO NY 09801.
    Carson L. Mader
    Footnotes
    1 Dr. Mader is chief, electron microscopy laboratory. Division of Research Sciences. US Army Institute of Dental Research. Walter Reed Army Medical Center, Washington, DC. Dr. Baumgartner is director, endodontic residency. US Army Institute of Dental Research, Walter Reed Army Medical, Center. Washington, DC. Dr. Peters is commander. US Army Dental Activities, 123rd Medical Detachment (Dental Service), APO NY 09801.
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  • Author Footnotes
    1 Dr. Mader is chief, electron microscopy laboratory. Division of Research Sciences. US Army Institute of Dental Research. Walter Reed Army Medical Center, Washington, DC. Dr. Baumgartner is director, endodontic residency. US Army Institute of Dental Research, Walter Reed Army Medical, Center. Washington, DC. Dr. Peters is commander. US Army Dental Activities, 123rd Medical Detachment (Dental Service), APO NY 09801.
    J. Craig Baumgartner
    Footnotes
    1 Dr. Mader is chief, electron microscopy laboratory. Division of Research Sciences. US Army Institute of Dental Research. Walter Reed Army Medical Center, Washington, DC. Dr. Baumgartner is director, endodontic residency. US Army Institute of Dental Research, Walter Reed Army Medical, Center. Washington, DC. Dr. Peters is commander. US Army Dental Activities, 123rd Medical Detachment (Dental Service), APO NY 09801.
    Search for articles by this author
  • Author Footnotes
    1 Dr. Mader is chief, electron microscopy laboratory. Division of Research Sciences. US Army Institute of Dental Research. Walter Reed Army Medical Center, Washington, DC. Dr. Baumgartner is director, endodontic residency. US Army Institute of Dental Research, Walter Reed Army Medical, Center. Washington, DC. Dr. Peters is commander. US Army Dental Activities, 123rd Medical Detachment (Dental Service), APO NY 09801.
    Donald D. Peters
    Footnotes
    1 Dr. Mader is chief, electron microscopy laboratory. Division of Research Sciences. US Army Institute of Dental Research. Walter Reed Army Medical Center, Washington, DC. Dr. Baumgartner is director, endodontic residency. US Army Institute of Dental Research, Walter Reed Army Medical, Center. Washington, DC. Dr. Peters is commander. US Army Dental Activities, 123rd Medical Detachment (Dental Service), APO NY 09801.
    Search for articles by this author
  • Author Footnotes
    1 Dr. Mader is chief, electron microscopy laboratory. Division of Research Sciences. US Army Institute of Dental Research. Walter Reed Army Medical Center, Washington, DC. Dr. Baumgartner is director, endodontic residency. US Army Institute of Dental Research, Walter Reed Army Medical, Center. Washington, DC. Dr. Peters is commander. US Army Dental Activities, 123rd Medical Detachment (Dental Service), APO NY 09801.
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      The scanning electron microscope was used to investigate the morphological characteristics of the smeared layer on the walls of root canals that had been instrumented with K-type files and irrigated with a 5.25% solution of NaOCl. The smeared material was examined from two perspectives. First, the scanning electron microscope was used to “look down onto” the smeared layer covering the canal wall. Second, the smeared material was looked at from the side or profile view. This was done by using the scanning electron microscope to scan the junction between the fractured dentinal tubules and the surface of the canal wall. The smeared material was found to consist of two confluent components; the smeared layer on the surface of the canal wall and the smeared material which had been packed into some of the dentinal tubules. The smeared layer on the canal wall was typically about 1- to 2-μm thick. The depth of the tubular packing varied from a few micrometers up to 40 μm.
      Se investigó a través del microscopio de barrido electrónico (SEM) las características morfológicas de la capa de barro dentinario de las paredes radiculares que habían sido instrumentadas con limas tipo K e irrigadas con solución de hipoclorito de sodio al 5.25% (NaOCl). El material fue examinado desde dos perspectivas. Primero, el SEM se usó para “mirar por encima” la capa embarrada cubriendo la pared del conducto. Segundo: el material fue observado desde el costado o visto de perfil. Esto fue realizado usando el SEM para barrer la unión entre los túbulos dentinarios fracturados y la superficie de la pared radicular. El barro dentinario se componía de dos elementos confluentes; la capa de barro dentinario de la superficie de la pared del conducto y el material que había sido empaquetado dentro de los túbulos dentinarios. La capa de barro dentinario fue generalmente de alrededor de 1 a 2 μ de espesor. La profundidad del empaquetamiento de los túbulos varió desde unos pocos micrones hasta 40 μ.
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